Cast to int for union tag

Union tag will be changed from `enum` to `enum class`. We need explicit
casting with enum class.

Bug: 225119187
Bug: 218912230
Test: m
Merged-In: I2401e66dc9d8bc511a601fcdce365e5f823576d4
Change-Id: I2401e66dc9d8bc511a601fcdce365e5f823576d4
(cherry picked from commit 1c4e9829ec684f1c33447f522db516b14e011255)
1 file changed